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dynamic list/menu

I have two list/menu in my form. Is there any way to make second list/menu option changes dynamically based on chosen option in first list/menu? Example: first menu has three option eg: A, B, C. If i select A then after selecting it 2nd list option will be : X, Y. But if i select B in 1st menu then 2nd menu option will be : V, W and so on. And it's all happens before submitting the form

Yes this has been done many times before and you will find hundreds if not thousands of examples of it on the web. I made one myself in response to a question like yours. The guy wanted the radio buttons instead of 2 selects.

Your welcome to use it if you like. Its simple to use, you have 2 options name and value (in that order) in each list ... ["Martin Rucinsky", 34802389] . If you want the value to be a string instead of a number - as I have in the example - just make sure you have quotes around it:
["Martin Rucinsky", "this is the value!"]

The display "The value of this option is" etc. is just there for a debugging tool. You can get rid of it by taking out the onchange attribute in the select.